Best way to mine resources in huge mountain?

[elminster]

Hi,

I have huge mountain near my base. Now I want to find steel there. What is the best way to look for steel under such huge mountain like this?

And second question. How many tiles I can mine before mountain roof will collapse and kill my colonist?

Screenshot ----> http://imgur.com/a/SFVzV

[Yaldabaoth]

http://steamcommunity.com/sharedfiles/filedetails/?id=755224256
This.

[Daffy]

Best way imo is to make 2 tile wide hallways out from the main hallway with 2 tiles apart. that way you cover most of the mounten without diggin out it all, i can not remember tiles you can mine out before the roof crubles down but it is like 8x8, if you dig out a large area just leave a pilar in the middle that will hold it.

[Effixel]

A roof can hold up to 6 tiles away from a wall. As for digging I use a checker pattern where I dig a 11x11 rectangle only every other tile. It takes half as much time to cover the area and you won't miss any ressource.
Even more efficient is to dig so that you have 4x4 pillars and corridors only 1 tile wide. I'll show you a screenshot later today.

[Quicksilver]

1 tile wide mining tunnels 2 tiles spacing, and a tunnel for each mining role colonist.

[grapplehoeker]

Dig a tunnel to a 8x8 chamber in the heart of the mountain and leave it.
Wait for an infestation to spawn there. Once it does, leave it to mature.
Let the critters do all of your mining for you ;)

[Verum Jones]

I use a 3 tile wide mine shaft with a 2 tile space inbetween the mine shafts and just dig the entire mountain out.This way with only the 2 tile spaces you can see if there are materials on either side,to judge if you need to expand the shaft or just keep digging.

[Trench Rat]

Main hallway(3 tiles to facilitate walls and door xDx) with 1tile wide "Strip" mines branching off. Make sure to seal off your main hallway and place an equipment rack with molotovs nearby.